The HVAC industry has suffered from system-sizing superstitions for generations. These superstitions are passed down with the honest assumption that they work. After all, if it did the job for grandad, it must be right. Unfortunately, these beliefs often have hidden consequences that lead to long-standing issues and a lot of aggravation.
Many customers suffer as a result because they fail to get the system they expected and often must deal with long-term issues that lead to discomfort and shortened equipment life. You (HVAC professionals) suffer from these beliefs because you’re left trying to correct the issues they create.